SQL Tutorial

SQL (Structured Query Language) is a standardized programming language used to manage and manipulate relational databases. It allows users to perform various operations on the data stored in a database, such as querying data, inserting new data, updating existing data, deleting data, and creating or modifying database structures (like tables and indexes).

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SQL stands for Structured Query Language. SQL is used to access and manipulate the RDBMS database. RDBMS stands for Relational Database Management System. RDBMS is a transactional database that includes Oracle, MySQL, SQL Server, etc.

Key Features of SQL:

1. Data Retrieval (Querying): SQL allows you to retrieve data from a database using commands like SELECT.

2. Data Manipulation: You can add, modify, or delete data using SQL commands such as:

INSERT INTO: Adds new data.

UPDATE: Modifies existing data.

DELETE: Removes data.

3. Data Definition: SQL lets you define and modify database structure (tables, relationships, etc.) using commands like:

CREATE: Creates a new database or database object (table, view, index).

ALTER: Modifies an existing database object.

DROP: Deletes a database object.

4. Data Control: SQL provides commands to control access to the data, such as:

GRANT: Grants permissions to users.

REVOKE: Removes permissions from users.

SQL is used for other operations also.

1) Users can create a view.

2) The user can create a store procedure.

3) Users can create Triggers.

4) Users can create functions.

SQL Tutorial – Interview Questions

Q 1: What is SQL?
Ans: SQL (Structured Query Language) is a standard language used to manage and manipulate relational databases. It allows users to create, read, update, and delete data stored in database tables.
Q 2: Why is SQL important?
Ans: SQL is important because it provides an efficient way to interact with databases, retrieve large amounts of data, and perform complex queries with high performance.
Q 3: Is SQL case-sensitive?
Ans: SQL keywords are not case-sensitive, but database names, table names, or column names may be case-sensitive depending on the database system.
Q 4: What are the main types of SQL commands?
Ans: The main types are DDL (Data Definition Language), DML (Data Manipulation Language), DCL (Data Control Language), and TCL (Transaction Control Language).
Q 5: Which databases use SQL?
Ans: Popular databases such as MySQL, PostgreSQL, Oracle, SQL Server, and SQLite use SQL.

SQL Tutorial – Objective Questions (MCQs)

Q1. SQL stands for:





Q2. Which SQL statement is used to extract data from a database?





Q3. Which type of language is SQL?





Q4. SQL is mainly used to:





Q5. Which database uses SQL?





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